Stadium: Court 2 Round: 62 Ground: Hardcourt outdoor
| ITF Vietnam F4 | 2016/09/13 07:10 | Chan-Yeong Oh v Issei Okamura | 6-7,3-6 |
| ITF M25 Daegu | 2023/06/04 01:00 | Issei Okamura v Jin Sung Han | 7-5,6-3 |
| ITF M15 Karuizawa | 2023/05/30 03:30 | Issei Okamura v Sanhui Shin | 6-3,2-6,1-6 |
| ITF M25 Nottingham | 2023/05/01 09:00 | Issei Okamura v Ryan James Storrie | 3-6,3-6 |
| ITF M25 Nottingham Qual | 2023/04/30 09:00 | Issei Okamura v Joseph White | 6-0,6-2 |
| ITF M25 Nottingham | 2023/04/25 09:00 | Issei Okamura v George Houghton | 2-6,1-6 |
| ITF M25 Nottingham Qual | 2023/04/24 13:00 | Issei Okamura v Max Benaim | 6-4,6-4 |
| ITF M25 Kashiwa | 2023/04/06 03:40 | Kaito Uesugi v Issei Okamura | 6-1,6-4 |
| ITF M25 Kashiwa | 2023/04/05 05:35 | Issei Okamura v Sho Shimabukuro | 7-6,0-6,7-6 |
| ITF M15 Daegu | 2022/08/29 00:30 | Sanhui Shin v Chan-Yeong Oh | 6-2,6-2 |
| ITF M15 Changwon | 2022/08/21 03:30 | Chan-Yeong Oh v Suk Hyun Choo | 6-2,3-6,7-10 |
| ITF M15 Changwon | 2019/10/14 01:30 | Chan-Yeong Oh v Young Seok Lee | 4-6,6-7 |
| ITF Korea F6 | 2018/08/30 04:50 | Chan-Yeong Oh v Yeongseok Jeong | 6-2,4-6,2-6 |
| ITF Korea F6 | 2018/08/29 04:30 | Chan-Yeong Oh v Hyung-Chan Lim | 6-2,6-2 |
| ITF Korea F5 | 2018/08/24 01:15 | Hong Chung v Chan-Yeong Oh | 7-5,6-1 |
| ITF Korea F5 | 2018/08/22 03:00 | Chan-Yeong Oh v Lucas Catarina | 4-6,6-2,6-1 |
| ITF Korea F5 | 2018/08/21 03:00 | Yuichi Ito v Chan-Yeong Oh | 7-6,6-7,3-6 |